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Teza Founder Says Firm Didn't Ask Ex-Goldman Programmer to Share Code

NEW YORK—High-frequency trading firm Teza Technologies LLC barred its employees from using the proprietary code of any other company in their work, one of the firm's founders said Monday.

Mikhail "Misha" Malyshev, a former executive at hedge-fund firm Citadel LLC, said all of Teza's employees, including former Goldman Sachs Group Inc. programmer Sergey Aleynikov, signed employment agreements in which they were prohibited from using other company's proprietary ideas.